Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d6d11eb4ea9e4a…

MALICIOUS

PDF

81.4 KB Created: 2021-07-02 00:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06fc2eefe9349c26949d30b05e0954c1 SHA-1: 90624494aaf11a7c0e1abc17e0690c5a55e17ecd SHA-256: 99d6d11eb4ea9e4ae24649563904e7251e2731b44ef64dbeabddb17c650935b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a7a46c91a---madoxumofewosesadakunona.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/1ea583769c16de1fe5fbe17e7cda2814/45777199236.pdf
    • http://ibiforstarlight.ca/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/zavunojimadota.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/9e13d4f8d65d3b08af5065943e57b279/57156113951.pdf
    • http://bidmitt.com/img/files/file/22760801026.pdf
    • https://alice-immo.com/userfiles/file/rizuvebunolopevas.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f68fe14499---22053384941.pdf
    • http://goraku-sangyo.com/userfiles/file/5258493385.pdf
    • http://elturo.ru/img/upload/files/xigazuxemoniwujesivozab.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607844d25c3da---nedukusoruwazatu.pdf
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wonunifijes.pdf
    • https://olivierdaulte.com/ckfinder/userfiles/files/41537591706.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbcaa7a289---fizonireludotigusuruvexat.pdf
    • http://gerd-pollak.de/userfiles/file/12837856712.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/897fc64f9ca5be74632e80a681be2d8e/23890531155.pdf
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/kaduparoruxamisumive.pdf
    • https://tectrongim.com/uploads/files/77657746135.pdf
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082001ecdfdb---49487192411.pdf
    • http://stark-tools.ru/images/uploaded/zasuxebimefujasolenito.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/0c8ec92ed09f0285eaad381a0b77e615/78017619381.pdf
    • https://vientangluc.com/upload/files/putose.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/4a462457fa40d9f63e456139109d1a88/verapab.pdf
    • http://atya.eu/files/file/24592205938.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609495ac6f369---pegofev.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=double+letter+words+ll
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000def9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF9 16792 bytes
font_01_sfnt_off0000f710.bin
ae863acd427cf4595f7e4f86d31e3025309b0d425150d25174684e6dd468ce80
pdf-font-stream PDF embedded font (sfnt) at offset 0xF710 10208 bytes
font_02_sfnt_off00010e26.bin
5aa43748d36504b8e7cb92d9ac256bfe9f0bce9d9188e111c0a1ef4ab9f2a085
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E26 16632 bytes